Hi and welcome to HCM.
I read carefully your concerns and i suggest to start anti acids or PPI's ( omeprazol)for stomach pain.
It seems to be gastritis
The painkillers like NSAID's ( ibuprofen
, aspirin, naproxen
etc) are aggressive for stomach.
So I suggest you consult a gastroenterologist
If you have any other concerns, feel free to contact me.
All the best